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A. RANKIN.

BUTT HINGE 'VII lazy-,4.

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IMPROVEMENT nt BUT-unless.

@te rbehirle nerreh tu. iu Hirst titters ntent mit making' und Hi 112,2 umr.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, ANDREW RANKIN, ot` Philadelphia, Pennsylvania, have invented an Improvement in Hinges; and I do hereby declarev the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention relates to an improvement in what are known as lift-oil` hinges, and my improvement consists of a roller applied to the two plates of a hinge, substantially as described hereafter, sovas to receive a portion of the strain which in ordinary hinges is received entirely by the pin of the joint, and so that undue wear and tear of the pin and excessive kiction of the joint may be avoided, the improved hinge at the same time prescnting a -neater appearance than a lift-ofi hinge of the ordinary construction.

In order to enable others skilled in the art to make and use my invention, I will now proceed to describe' its construction and operation. On reference to the accompanying drawing, which forms a part of this speciiication Figure 1 is a vertical section of the hinge at the joint.

Figure 2, an exterior view of the rear of the hinge.

Figure 3, a sectional plan.

Figure 4, a perspective view; and

Figure 5, a view of an ordinary lift-olf hinge.

Similar letters refer to similar parts throughout `the several views.

The ordinary lift-oli" hinge, as seen in Figure 6, consists of the plate A, with its tubular projection a, and the plate A', with its tubular projection a', the pin e forming the joint being secured to the projection a of the plate A, and the projecting portion of lthe pin litt-ing snugly but freely in and passing through the projection et of the plate A', so that the latter can be readily raised and'dctached from the pin. In hinges of this class,it is usual to place over the pin ve a washer, d, which intlervenes between the lower end of the projection a of one plate and the upper end of the projection a of the other plate. This washer serves in a measure to diminish friction, but does not prevent the distortion of the hinge, which must eventually take place, as the strain -is in the directionA of the arrow, iig. 6, owing to the weight of the door, which is secured to the plate A. This strain gradually wears the pin c until the edge :c bears against the tubular projection a of the plate A, while the projection a of the plate Al recedes from the edge y of the plate A, thereby leaving an unsightly opening or gap at y, and causing undue' friction at x. In order to prevent this, I make in the tubular projection a of the plate A a transverse recess for the reception of the horizontal roller m, which turns on the pin e, or on a separate pin, f, inserted from below. The roller bearing against the concave edge z of the plate A servesto relieve the pin e from a great portion of the strain to which it is subjected '-in the ordinary hinge, the two plates are maintained in their proper relative position, the objectionable openings at the joints above alluded to are thus prevented, the free movement of the plates is not obstructed by undue friction, and the hinge presents generally a neater appearance, especially as seen in iig. 2.

I claim as my. invention, and desire to-secure by Letters Patent- The roller m, adapted to the tyeplates of a lift-oli' hinge, substantially in 'the manner and for the purpose herein set forth.

In testimony whereof I have signed my'name to this specication inthe presence of two subscribing witnesses.

ANDREW RANKIN.

Witnesses H. How'son, C: HowsoN. 

